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For most people with a vitamin B12 deficiency, oral supplements are an effective way to bring your levels up to normal, says Foxx, and research backs this up (2)

"Proof of a causative effect of B12 supplements on acne development will require randomized control trials with enough subjects to see a significant effect, if one exists," he told Live Science

Purification and Detection High performance liquid chromatography (HPLC) purification: The synthesized polypeptides need to be purified by HPLC to remove impurities and unreacted raw materials, ensuring that the purity meets the pharmaceutic-grade standard

& Claeyssens, F